Dynamically changing provider

Question

I need to dynamically change provider for pop3s. I have a class (in jar) from a pop3s vendor of type STORE. I've tried to use
Provider provider = new Provider (....);
session.setProvider(provider);
and everything worked fine in desktop environment (java 1.6, latest javamail).
BUt then I tried the same on a Java CAPS integration server (similar to Sun APp server 8, some older version of javamail included in j2ee.jar), and I am getting java.lang.IllegalAccessError saying I can't call the constructor for Provider (maybe it is protected in older versions of javamail?). Is there any other way, how to dynamically create and set a provider?

Answer 1

I don't understand what's producing the "property exists" message.
Is it being written to System.out? Is it an exception? How are you
trying to set that property?
For the second option, you don't need to change the list of providers.
JavaMail should discover all the providers, including your new one,
assuming it's properly packaged with a META-INF/javamail.providers
file. I don't understand what you mean when you say JCAPS won't allow
you to include that file. The provider should be packaged as part of
your application along with that file, either in its own jar file or in the
jar file containing your application.